feat: improve profiler performance

[edusperoni]

This improves the profiler by reducing string copying as well as running it all in C++ (no more entering JS to generate the output). As a result, memory is much more stable and performance is improved, allowing you to run long and accurate traces

[Copilot]

Pull request overview

This PR improves profiler performance by migrating trace processing from JavaScript to C++, reducing string copying and improving memory stability for long-running traces.

Changes:

• Refactored the tracing agent to store traces in C++ instead of processing them in JavaScript
• Updated inspector interfaces to use const references for better performance
• Added JSON library (nlohmann/json) to third_party for JSON parsing in C++

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
v8ios.xcodeproj/project.pbxproj	Added third_party directory to project structure
NativeScript/inspector/ns-v8-tracing-agent-impl.mm	Refactored trace writer to use chunked storage and removed JavaScript trace processing
NativeScript/inspector/ns-v8-tracing-agent-impl.h	Updated interfaces to return vector of strings and added chunking methods
NativeScript/inspector/JsV8InspectorClient.mm	Added JSON parsing for trace configuration and removed JavaScript-based trace processing
NativeScript/inspector/JsV8InspectorClient.h	Updated method signatures to use const references
NativeScript/inspector/InspectorServer.mm	Updated method signatures to use const references
NativeScript/inspector/InspectorServer.h	Updated method signatures to use const references
.clang-format-ignore	Added third_party directory to format ignore list

Comments suppressed due to low confidence (1)

NativeScript/inspector/JsV8InspectorClient.mm:1

• Lambda captures message by value, creating an unnecessary string copy. Since Send takes a const std::string&, the lambda parameter should also be const std::string&: [channel, q](const std::string& message).

#include <Foundation/Foundation.h>

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